Close your eyes and summon up a visual image of the right side of your brain.
Then do the same for the left side.
Quickly sketch the image that you see. Go with the first thing that comes to mind. Don't overthink.
When I first did this exercise, I saw my right brain as a mountainside meadow filled with wildflowers and people dancing and singing.
I saw my left brain as walls lined with steel shelves. There was a steel trap on one of them, but it was covered with dust.
Nowadays, my left brain is neater and cleaner . . . but the first image is telling, isn't it?